Thesis (M.S.C.I.T.)--Regis University, Denver, Colo., 2005. / Title from PDF title page (viewed on Dec. 5, 2005). Includes bibliographical references.

Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 177-178).

Thesis (Ph. D.)--University of Missouri-Columbia, 2005. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (May 25, 2006) Vita. Includes bibliographical references.

Thesis (Ph. D.)--Ohio State University, 1987. / Includes vita. Includes bibliographical references (leaves 108-117). Available online via OhioLINK's ETD Center.

The development of pulse code modulation systems and electronic exchanges, together with the increase in volume of data traffic, have made it desirable to establish a means for handling both voice and data trarfic in the telephone network. A technique is required whereby integrated voice and data switching may be accomplished in an electronic exchange. It is proposed that a data adaptor unit be incorporated in electronic exchanges for the ourpose of concentrating data traffic onto PCM highways. A conceptual design for the architecture of such a unit is presented and its performance evaluated. The protocols for connecting data adaptors into a network, and the use of flow control procedures for regulating data traffic within the network, are described. The hardware implementation of the unit is not considered. The proposed data adaptor operates on the packet switching principle. It is comprised of three types of modules each dedicated to carrying out a particular communication function. The modules are the interface processor that interacts with data transmitting devices, the network processor for sending data over PCM channels between adaptors, and the supervisory processor for regulating activities within the adaptor unit.

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Wireless optical MIMO links can achieve very high data transmission rates by exploiting spatial diversity at a grand scale. Although such links can achieve high rates, their practical implementation remains challenging. The difficulty in implementation arises due to the complex transmitter and receiver designs required to overcome the channel impairments. This thesis considers practical transmitter and receiver designs for the wireless optical MIMO channel in the presence of channel impairments. In the first part of the thesis, two techniques to improve channel capacity for wireless optical MIMO channels are presented. The first technique uses multilevel half toning to reduce quantization noise power. For quantization noise-limited systems, increasing the number of quantizer levels provides gains in capacity. For example, at a rate of 200fps, a four-level quantizer gives approximately a two-fold increase in capacity over a binary-level quantizer for all frame sizes considered. The second technique uses higher order noise shaping to shape the quantization noise to the out-of-band spatial frequency spectrum. This technique is shown to be useful when the number of levels is small, i.e., near 2. In the second part of the thesis, the receiver design for wireless optical MIMO channels with magnification is considered. The work done in this part constitute a step towards the practical implementation of such links since it is the first time the effects of spatial transformations are considered. Signal magnification introduces varying spatial frequency inter-channel interference (SF-ICI) at the receiver. A novel receiver design that uses complex windowing with decision feedback equalization is used to equalize the SF-ICI in spatial frequency domain. For SF-ICI limited channels, the novel receiver design achieved a low bit-error rate compared with rectangular windowing with zero-forcing equalization. However, for noise limited channels, rectangular windowing with zero-forcing equalization is the receiver design of choice. / Thesis / Master of Applied Science (MASc)